ROBUST DISTURBANCE CANCELLATION IN AN ACTIVE DYNAMIC VIBRATION ABSORBER SYSTEM

Two controllers for an active dynamic vibration absorber are designed to reduce the vibration to zero at specified frequencies and to non-resonant levels at the others. One of them contains a disturbance observer and asymptotically realizes a feedforward control of disturbance cancellation. It preserves the regulation property independent of perturbations in the primary system, but is sensitive to those in the absorber system. The other incorporates a disturbance model into its feedback loop. It preserves the regulation property in the presence of perturbations in both the primary and absorber systems. The designed controllers are studied experimentally.